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參數(shù)資料
| 型號(hào)： | NCV4276 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 400 mA Low-Drop Voltage Regulator(400mA低壓降穩(wěn)壓器) |
| 中文描述： | 400毫安低壓降穩(wěn)壓器（400mA的低壓降穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 15/23頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | NCV4276 |
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NCV4276, NCV4276A
http://onsemi.com
15
Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 48) is:
PD(max)
[VI(max)
VQ(min)]IQ(max)
VI(max)Iq
where
V
I(max)
is the maximum input voltage,
V
Q(min)
is the minimum output voltage,
I
Q(max)
is the maximum output current for the
application,
I
q
is the quiescent current the regulator
consumes at I
Q(max)
.
Once the value of P
D(max)
is known, the maximum
permissible value of R
JA
can be calculated:
150
°
C
(1)
RJA
TA
PD
(2)
The value of R
JA
can then be compared with those in the
package section of the data sheet. Those packages with
R
JA
less than the calculated value in Equation 2 will keep
the die temperature below 150
°
C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
SMART
REGULATOR
Iq
Control
Features
I
Q
I
I
Figure 48. Single Output Regulator with Key
Performance Parameters Labeled
V
I
V
Q
}
Heatsinks
A heatsink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and
the outside environment will have a thermal resistance.
Like series electrical resistances, these resistances are
summed to determine the value of R
JA
:
RJA
RJC
RCS
where
R
JC
is the junction
to
case thermal resistance,
R
CS
is the case
to
heatsink thermal resistance,
R
SA
is the heatsink
to
ambient thermal
resistance.
RSA
(3)
R
JC
appears in the package section of the data sheet.
Like R
JA
, it too is a function of package type. R
CS
and
R
SA
are functions of the package type, heatsink and the
interface between them. These values appear in data sheets
of heatsink manufacturers.
Thermal, mounting, and heatsinking considerations are
discussed in the ON Semiconductor application note
AN1040/D.
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| NCV431AIDMR2 | PROGRAMMABLE PRECISION REFERENCES |
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| NCV4949 | 100 mA, 5.0 V, Low Dropout Voltage Regulator with Power-On Reset(100 mA, 5.0 V, 具有上電復(fù)位功能的低壓差穩(wěn)壓器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV4276/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Drop Voltage Regulator |
| NCV4276_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:400 mA Low−Drop Voltage Regulator |
| NCV4276A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:400 mA Low−Drop Voltage Regulator |
| NCV4276ADS50G | 功能描述:低壓差穩(wěn)壓器 - LDO ANA LDO REG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4276ADS50R4G | 功能描述:低壓差穩(wěn)壓器 - LDO ANA LDO REG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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